Guide for working implements



Jan. 1, 1929.

C.C.HANSEN GUIDE FOR WORKING IMPLEMENTS 2 Sheets-Sheet 1 Filed Nov. 5, 1927 I I INVENTOR. tlzaalesallanden z x Hi5 ATTOR Y Jan. 1, 1929. 1,697,648

C- C. HANS-EN I GUIDE FOR WORKING IMPLEMENTS Filed Nov. 5, 1927 2 Sheets-:Sheet 2 IN V EN TOR.

BY v l Patented Jan. 1, 1929.

CHARLES c. HANSEN, or nas'ron, PENNSYLVANIA, nssrener. so INGERSGLL-RAND COMPANY, or JER$EY CITY, NEWIJEBSEY, A CORPORATION or new mess -.1

GUIDE Foe WORKING IMPLEMENTS.

Application filed November 3, 1927. Serial no 230,783.

' This invention relates to rock drills, but more particularly to a guide for working implements adapted to be actuated by fluid actuated rock drills of the hammer type.

One object of the invention is to maintain the working implement in axial alignment with the rock drill whereby'it is actuated and thus prevent the deflection of the working implement from'a desired course.

Another object is to facilitate the starting of thedrillhole. This'may be accomplished by guiding the working implement near its cuttingbit and thus prevent a gyratm'y movement of the cutting bit at the time; the drill hole is being started, Other objects will be in partobvious and in; part pointed out hereinafter..;

The invention consists'of the combination of elements and arrangement of parts having the generalmode of operation substan- V tially as hereinafter described and claimed fied form of guide.

Referring more particularly'to the drawings, A and B generally designate two rock drills, only the front heads (land a portion of the cylinders D of which are shown. The

rock drills A and B may be held in operative 7 relationship with respect-to each other by means of a mounting E of the type illustrated and described in the pending application of Charles C. Hansen SerialNo. 215,366

entitled, Mounting for rock drills, and filed August 25, 1927.

As described in the aforesaid application, the mounting E may be slidably disposed inv a rock drill shell F only the front end of which is shown in the present instance for illustrative purposes. The shell F may be secured to a column or other support'in a well known manner andis provided with a course of cut.

feed screw G whichengages a threaded feed nutH carried bythemounting E for effect ing relative longitudinal movement between the rcck drills A and B and the supporting S1611 n r Extending into the frontiheads C are drill steels against which the blows of the hammer piston (not shown) may be delivered. N ear the rearward end of the drill steels are formed collars K which cooperate with the front ends of bushings L in the front heads for limiting the distance which the drill steels may extend into the path of the hammer pistons (not shown)- f the rock drills. Any

suitable means, such as spring pressed pawl retainers L, may be disposed in the front heads C. to cooperate with the collars K for preventing ejectionof the drill steels J from the front heads.

In accordance withthe present invention, means are provided for maintaining the drill steels J in axial alignment with the rock drills drill steels J tend to decline from the desired This is due largely to the loose fit of the shank portions of the drill steels in the bushings L or such other equivalent means which may serve as chucks forvthe drill steels. a 7 v V The means provided for the purpose described vcomprise in this instance a support 0 which may abut at its rearward end the frontend of the shell F to which it is secured in this instance by means of bolts P. The support 0 is preferably of a length somewhat in excess of the maximum length of travel of the rock drills A-and B in the shell F, so that the front end of the support 0 occupies a position somewhat in advance of the front end of the front headsC when the rock drills A and B occupy their extreme forwardmost positions which the shell Fwill permit.

The forwardmost end of thesupport 0 may be bifurcated to form a pair of lugs Q inwhichfare formed bores R for the reception 'of a pivot pin S.

On the projecting; ends of thepivot pins S is mounted a guide T which, in its operative position, extends laterally of thesupportvO.

A and B, particularly when drilling horizone tal holes, in which caseithe free ends of the The guide T may be held in this position in any suitable manner. The meansemployed for this purpose in the present instance comprise an eye-bolt U pivoted in a lateral projection V located near the front end of the support Oi The eye-boltU is adapted to lie in a slot W in the guide T, and a nut X threaded on the eye-bolt serves to clamp the the open ends of the forks Y, pins are disposed in the free ends of the branches Z and b. The pins 0 are inserted from the outer side of the forks Y and in thisinstance are held against accidental removal by a coil spring cl which may exert a constant pressure on the outer ends of the pins 0 tending to move them in an inwardly" direction. If desired, links 6 may be interposed between the ends of the spring d and the pins 0. Grooves f are preferably formed in the ends of the branches bof the forks Y to engage the spring (Z. v

' In the operation of the device, whenever it is desired to change the drill steels J for steels of greater length, the pins 0 may be removed from the forks Y and the eye-bolt U may be rocked out of the slot W to enable the guide T to be rocked out of the operative position. If then the pawls L are rocked out of the path of the collars K of the drill steels J,the drill steels J may be freely removed and others inserted in the front heads C.

After such insertion of the drill steels in the front heads, the guide T may be restored to its operative position and locked in that position by means of the eye-bolt U and the nut X. Thereafter the pins 0 may be inserted in the forks Y wherein they will be held securely by the spring. d. The drilling apparatus will then be in readiness to advance the drill holes to a greater depth and the drill steels J will at all times be held coaxial with the rock drills A and B. This is an advantageous feature in devices of this character since it is essential that the adjacent drill holes are drilled substantially parallel with respect to each other and perpendicular to the mounting, such as a column or quarry bar on whichthe apparatus may be mounted, so that the Working implements used during a succeeding broaching operation ma retrace substantially the path traveled by t e drill steels. g

Another distinct advantage of the present invention-is the manner in which'the free ends of the drill steels are held against gyratory movement at the time the drill hole is being started, particularly when the entrance to the drill hole is being formedon a slanting rock surface. Ordinarily, in the absence of suitable guide means,vthe bit end will creep to the lowermost point of a concentric circle which the bit end tends to describe about its longitudinal axis. 7

In'the modification illustrated in Figures 4 and 5, broaching tools 9 of the flat rectangular type are substituted for the drill steels to remove walls h of rock between adjacent drill holes These broaching tools 9 may be of considerable length, depending upon the depth of cut and, consequently, of such weight that their free or cutting ends tend strongly to decline from the axis of the rock drills A and B.

In shallow cuts, such declination of the cutting-ends of the broaching tools 9 may not be objectionable although, obviously, a greater length of time is required and a greater expense involved in removing the comparatively large mass of material than would be necessary if the cutting bits followed-the narrower portion of the walls h. When making cuts of great depth, however, such declination of the broaching tools 9 is not only serious both in the matter of time and expense but, if not checked, the broaching tools may depart entirely from the drill 7 holes andform a deflected cut in the solid rock. In order to avoid an occurrence of this kind, a guide I: is pivoted on the pin S and carries at its free end a pair of off-set wings 0.

On the uppermost sides of the wings 0 are bearlng'surfaces 79 over which the broaching tools 9 may be slidably moved in the direction of the work.

At each side of the bearing surfaces 39 are formed upwardly extending prongs g to prevent sidewise movement of the broaching tools g. The prongs 9 may be of any suitable length and are preferably spaced with respect to each other only a slightly greater distance than the width of the broaching tools g.

From the foregoing it will be readily seen that after the operation of drilling the holes 7' has been completed, and the broaching tools 9 have been substituted forthe steels J, an adequate guide may be provided for the broaching tools by simply substituting the guide 75 for the guide T used in connection with the drill steels J.

I claim: 3

In combination with a plurality of rock drills and a supporting shell therefor, working implements in the rock drills, a support secured to the front end of the shell and ex tending in advance of the rock drills, a lateral projection on the support, a guide pivot ed to the support, a plurality of forks on the guide to slidably receive the free ends of the Working implements, pins through the ends position, and means including an eye-bolt of the forks cooperating With the forks to anda nut attached to the lateral projection form bearings for the Working implements for holding the guide in operative position. 10

and thus hold the said Working implements In testimony whereof I have signed this in axial alignment With the rock drills, a specification.

spring acting on corresponding ends of the pins for maintaining said plns 1n operatlve CHARLES C. HANSEN. 

